Matting of artificial silk



Patented July 19, 1938 UNlTED STATES PATENT OFFICE MATTING F ARTIFICIAL SILK Main, Germany No Drawing. Application October 1, 1937, Serial No. 166,833. In Germany October 13, 1936 3 Claims. (Cl. 28-1) Our present invention relates to a process for producing matt effects on artificial silk and more particularly to such a process wherein these effects are obtained by a treatment of the already I 5 finished threads or fabrics.

Dimculty is experienced in working up matted spun artificial silk since the pigment contained in the fiber attacks the thread guide, platens and needles. It is therefore frequently preferred to apply the matting operation subsequently to the silk in the piece, although the diminution of luster which can be attained by this method is far inferior in its properties to that attained by matting during spinning. Above all the uniformity and durability of the effects which can be produced by most after-treating agents leave much to be desired. These disadvantages are also associated with matting on the foulard in which the fiber is padded with a coarse or nonuniform layer; in a still greater degree is this the case in the usual two-bathprocess. In this process the fiber is first saturated with, for instance,

a solution of Glaubers salt and then after-treated in a barium chloride bath. A considerable portion of the sulfate formed passes into the bath whilst the remainder is deposited only loosely on the fabric and easily becomes detached in the form of a dust. Attempts have indeed been made to obviate this drawback by the use of adhesives but even this expedient has not led to unobjectionable mattings.

According to the present invention uniform and durable matt effects are obtained by first fixing on the fiber fast to washing and soaping sulfate radicles in form of insoluble sulfates of organic amines containing a hydrocarbon radicle of at least 10 carbon atoms, thoroughly rinsing the material thus treated and then developing in the usual manner, for instance in a barium chloride bath. Instead of barium chloride there may be used a salt of another base of which the sulfate is more sparingly soluble than that of the substance having amnity for the fiber. The developing bath remains completely clear so that no undesired precipitations on the fiber can occur. The matting thus obtained is deep and uniform; the feel of the silk is soft and full whereas it is easily rendered hard and dead by the hitherto usual after-treating agents.

The following example illustrates the inven- -tion:-

Viscose artificial silk is treated for a short time at 0 C. in a bath containing per liter 5 6 grams of the hydrochloride of stearyl biguanide,

then wrung. out, well rinsed and introduced into a Glauber's salt bath. After having been rinsed the fabric is treated with a solution of barium chloride, advantageously at araised temperature. 1 The artificial silk thus treated shows a deep matt effect and has an excellent feel; the matting agent does not become detached as dust.

The procedure described in this example may also be modified by treating the artificial silk with stearyl biguanide sulfate which is maintained in solution by means of the polyglycol ether of oleyl alcohol described in English Specification No. 380,431; the material is thereupon treated with a solution of barium chloride as above described.

With similar results there may be used the hydrochloride or sulfate ofstearylamino-aminooxazolidine, iminostearylaminomethylimidazoline or of the stearoyl compound of unsymmetrical dimethylmethylenediamine or of another base having afiinity for the fiber.

With the expression base having an affinity for artificial fibers such organic bases of high molecular weight or the salts thereof are meant, which dissolved in water to form solutions of about 0.05 per cent. strength, are absorbed by the fibers under corresponding exhaustion of the bathand remain on the fiber even when washing or soaping the latter.

It is obvious that our invention is notv limited to the foregoing examples nor to the specific details given therein. Instead of stearyl biguanide chloride or sulfate respectively any other alkylbiguanide salt, having in the alkyl radicle at least 10 carbon atoms, may be used. The alkylated and hydroxyalkylated derivatives of the said biguanides and of the other compounds mentioned above show the same capacities. Furthermore, instead of barium chloride any other soluble barium compound may be used for developing the matt effect on the fiber.

What we claim is:

1. The process for producing matt efiects on artificial silk which comprises fixing on the-fiber sulfate radicles in form of insoluble sulfates of organic bases containing a hydrocarbon radicle of at least 10 carbon atoms, rinsing the material and treating it in a bath containing a water-soluble barium compound.

-2. The process for producing matt effects on artificial silk which comprises treating the fiber in a bath containing a water-soluble salt of an alkylbiguanide containing an alkyl radicle with at least 10 carbon atoms, rinsing the material, treating it in a bath containing 804" ions and then introducing it into a bath. containing a water-soluble barium compound.

3. The process for producing matt effects on artificial silk which comprises treating thefiber in a bath containing stearylbiguanide hydrochloride, rinsing the material, treating it in a bath containing Glaubers salt and then in a bath containing barium chloride.

KARL BRODERSEN. MATTE-HAS QUAEVLEG. 

